The two routes travel north as a four-lane undivided highway with a center turn lane.

In the unincorporated community of Lobdell, LA 415 turns off the divided highway to continue north on a two-lane undivided road.

[1] The road continues to parallel the levee through northern West Baton Rouge and eastern Pointe Coupee parishes passing multiple minor state highways along its route.

Near its northernmost stretches, LA 415 travels on land that was once the channel of the Mississippi River.

The entire highway is in Port Allen, West Baton Rouge Parish.